男,54岁。车祸1小时入院,诊断:骨盆骨折及左胫骨开放性骨折。此时患者最容易发生下列哪种并发症()
A.休克
B.泌尿系统感染
C.血栓形成
D.褥疮
E.脂肪栓塞
参考答案:A
3a2b﹒( )=12a5b4+9a4b3-6a3b3
________they visited the Science Museum, they showed great interest in everything they saw. [ ]
A. The first time
B. For the first time
C. At first
D. At the first time